they are not created or destroyed
1. Box A and box B have the same density.
Box A has more volume. Which box has
more mass?
a) Box A
b) Box B
Answer:
b
Explanation:
When a car driver puts their foot on the brake pedal, the brake fluid is pushed down a narrow tube connected to the brake. Since brake fluid is hard to squash, the brakes are put on immediately. What is the scientific term for squash?
When a car driver puts their foot on the brake pedal, the brake fluid is pushed down a narrow tube connected to the brake. Since brake fluid is hard to squash, the brakes are put on immediately the scientific term for squash is compressibility.
What is compressibility?The scientific term for squash is "compressibility". In the case of brake fluid, it has very low compressibility, which means that it cannot be easily compressed or squashed, resulting in immediate and effective brake application when pressure is applied to the brake pedal.
The term "compressibility" describes how much a particular volume of matter shrinks under pressure. A solid or a liquid under pressure essentially maintains its volume. The solid or liquid's constituent atoms, ions, or molecules are in close proximity to one another.
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A demand o2 delivery system utilizes a _________________ to trigger o2 flow.
A demand O2 delivery system utilizes a "pressure drop" mechanism to trigger oxygen flow.
In a demand oxygen delivery system, the flow of oxygen is triggered by a pressure drop that occurs when the user initiates inhalation. When the user takes a breath, the drop in pressure in the system activates the mechanism that releases oxygen.
This mechanism can be a valve or regulator that opens to allow oxygen to flow from the source to the user.
The pressure drop required to trigger the oxygen flow depends on the specific design of the system and can vary. Generally, the pressure drop is set at a level that ensures the user's inhalation effort is sufficient to activate the oxygen flow while maintaining a safe and reliable operation.
The pressure drop is typically calibrated and adjusted during the manufacturing process to meet the desired specifications and requirements of the system.
In summary, a demand oxygen delivery system relies on a pressure drop mechanism to initiate the flow of oxygen. This mechanism ensures that oxygen is released when the user inhales, providing them with the required oxygen supply.
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In the box below sketch separately a microscopic view of one sodium chloride and one methanol in a solution of water, H
2
O. In the case of methanol, simply draw a sphere to represent a methanol molecule (i.e., no need for a skeletal structure).
Microscopic view of sodium chloride in water can be imagined as a water solution with sodium chloride dissolved in it. In the solution, sodium chloride dissociates into sodium ions (Na+) and chloride ions (Cl-).
The sodium ions are represented by small spheres with a positive charge (+), and the chloride ions are represented by small spheres with a negative charge (-). The water molecules (H2O) surround these ions, with their oxygen atom (O) partially negatively charged and their hydrogen atoms (H) partially positively charged due to the polar nature of water.
Microscopic view of methanol in water:
In a water solution containing methanol, the methanol molecules are represented by small spheres.
The methanol molecule consists of one carbon atom (C) bonded to three hydrogen atoms (H) and one hydroxyl group (OH). The water molecules (H2O) interact with the methanol molecules, with their oxygen atom (O) forming hydrogen bonds with the hydroxyl group of methanol.
Please note that these descriptions are a simplified representation of the microscopic view of the substances in solution and are not to scale or depict precise molecular arrangements.
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a 1) How would you make 1 liter of a 10% NaCl solution from a solid stock? Provide details of what kind of containers you would use.
To make 1 liter of a 10% NaCl solution from a solid stock, you will require the following materials and containers.MaterialsSolid NaClDistilled water1-Liter volumetric flask250-mL volumetric flask 2-beakersProcedureTo prepare 1 liter of a 10% NaCl solution, the following procedure should be followed:Measure out 100g of NaCl using a balance.
Measure the weight of an empty 250-mL volumetric flask.Add the NaCl to a 250-mL beaker and add a small amount of distilled water to it to dissolve the NaCl.Carefully pour the dissolved NaCl solution into the 250-mL volumetric flask. Add distilled water to the mark on the flask to make up the volume. Stopper the flask and invert it several times to mix the solution.Measure the weight of the 1-Liter volumetric flask.Add the 250-mL volumetric flask solution to a 1-Liter volumetric flask.Add distilled water to the mark on the flask to make up the volume.
Stopper the flask and invert it several times to mix the solution.The final volume of the solution will be 1 liter of a 10% NaCl solution.PrecautionsEnsure the NaCl has completely dissolved before adding more water to avoid making a less concentrated solution.Measure the weight of the volumetric flask before and after adding the solution to calculate the volume of solution that was added.Use distilled water to prepare the solution.
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what are examples of soluble salts (metal+acids)
Answer:
Chloride salts - made of HCI
Nitrate salts - made of HNO3
Sulfate salts - made of H2SO4
These are all the examples I could think of.
In the diagram of a transverse wave shown, what does M represent?
Transverse Wave
P=1cycle per second
A. Wavelength
B. Frequency
C. Amplitude
D. Rest positions
In the diagram of a transverse wave, P = 1 cycle per second, M represent wavelength. Therefore, option A is correct.
What is transverse wave ?A wave is considered to be transverse if its oscillations run counterclockwise to the wave's direction of advance. A longitudinal wave, on the other hand, moves in the direction of its oscillations. Transverse waves include water waves.
Due to the shear stress produced, transverse waves are frequently observed in elastic solids; in this situation, the oscillations are caused by the displacement of the solid particles from their relaxed state in directions perpendicular to the wave's propagation.
Trough: A transverse wave's lowest point. The distance separating one transverse wave's peak from the next is known as the wavelength. The distance from the wave's resting position to its crest is its amplitude.
Thus, option A is correct.
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In the second period, the atomic radii decrease as one moves from lithium to neon. TRUE OR FALSE?
TRUE. The trend in the periodic table is for atomic radii to decrease from left to right across a period.
What is the periodicity of atomic radii along a period?The statement "In the second period, the atomic radii decrease as one moves from lithium to neon" is TRUE.
As you move from lithium to neon in the second period of the periodic table, the atomic radii decrease. This is because the number of protons in the nucleus increases, resulting in a stronger positive charge. The electrons are pulled closer to the nucleus, making the atomic radius smaller. This is due to an increase in the number of protons in the nucleus, which increases the attractive force on the electrons and pulls them closer to the nucleus.
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a 185.0 ml 185.0 ml solution of 2.320 m 2.320 m strontium nitrate is mixed with 210.0 ml 210.0 ml of a 2.742 m 2.742 m sodium fluoride solution. calculate the mass of the resulting strontium fluoride precipitate. mass: g g assuming complete precipitation, calculate the final concentration of each ion. if the ion is no longer in solution, enter a 0 for the concentration.
The final concentrations of strontium ion, sodium ion, and fluoride ion (which has precipitated as strontium fluoride) are 1.087 M, 2.914 M, and 0 M, respectively.
The balanced chemical equation for the precipitation reaction is:
Sr(NO3)2 + 2 NaF → SrF2 + 2 NaNO3
moles of strontium nitrate = concentration x volume = 2.320 mol/L x 0.1850 L = 0.4292 mol
moles of sodium fluoride = concentration x volume = 2.742 mol/L x 0.2100 L = 0.5752 mol
moles of strontium fluoride = 0.4292 mol x (1 mol SrF2 / 1 mol Sr(NO3)2) = 0.4292 mol
mass of strontium fluoride = moles of strontium fluoride x molar mass = 0.4292 mol x 125.62 g/mol = 53.68 g
total volume = 185.0 mL + 210.0 mL = 395.0 mL = 0.3950 L
concentration of strontium ion = moles of strontium ion / total volume = 0.4292 mol / 0.3950 L = 1.087 M
Moles of sodium ion = 2 x moles of sodium fluoride = 2 x 0.5752 mol = 1.1504 mol
concentration of sodium ion = moles of sodium ion / total volume = 1.1504 mol / 0.3950 L = 2.914 M
Concentration refers to the amount of a solute dissolved in a given amount of solvent or solution. It is usually expressed in units of molarity (moles per liter) or weight per volume (grams per liter). There are various methods for measuring concentration, including titration, spectrophotometry, and gravimetry. These methods allow chemists to accurately determine the amount of solute in a solution and adjust the concentration as needed.
Concentration plays a crucial role in many chemical reactions and processes. It can affect the rate of a reaction, the yield of a product, and the properties of a solution. For example, a higher concentration of reactants can increase the rate of a reaction, while a higher concentration of a solute can increase the boiling or melting point of a solution.
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How many hydrogen atoms are in 4 molecules of H2O?
Answer: 8
Explanation:
Answer:
I think the answer is 4 or 3, it could be 2 as well, I'm not sure.
Explanation:
What are the half-reactions for a galvanic cell with aluminum and gold electrodes?
A. A3+ (aq) + 3e > Al(s) and Au+(aq) + e* → Au(s)
B. Al(s) → A13+(aq) + 3e and Aut(aq) + e
Au(s)
C. AB+(aq) + 3e – Al(s) and Au(s) — Au (aq) + e
D. Al(s) → AB+(aq) + 3e and Au(s) → Au(aq) + e
Answer:B is right
Explanation: Al loses electrons and is oxidised, Au gains electron. And is reduced
To solve such this we must know the concept of half cell reaction. Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e \(\rightarrow\)Au(s)
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Al loses electrons and is oxidized, Au gains electron. And is reduced.
Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e \(\rightarrow\)Au(s)
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Question 4 "That oil sands executive is greedy and heartless and therefore can't be trusted when she claims to want to improve her company's environmental record."
O False dilemma
O Ad hominem attack
O Straw man
O Appeal to authority
Question 5 "There is no proof that humans are causing climate change so it must natural causes
O False dilemma
O Appeal to ignorance
Strawman
O Appeal to authority
That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.
4- The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.
The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.
5- The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.
The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.
So, Option B is correct.
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which sequence represents a correct order of historical developments leading to the modern model of the atom
The modern model of the atom are Discovery of the electron, Rutherford's atomic model, Bohr's atomic model, and the development of quantum mechanics.
What is the modern model of the atom? The modern model of the atom consists of three main components; a nucleus, which contains protons and neutrons, and a cloud of electrons that orbit the nucleus. The protons and neutrons in the nucleus are held together by a strong nuclear force. The electrons are held in orbit around the nucleus by the electromagnetic force. The number of protons in the nucleus determines the type of atom. For example, a hydrogen atom has one proton, while a carbon atom has six protons. The number of neutrons can vary, but the total number of protons and neutrons must equal the atomic mass. The electrons are arranged in shells around the nucleus, with each shell having a specific number of electrons. The number of shells and the arrangement of electrons determines the chemical properties of the atom. The modern model of the atom allows for a better understanding of how atoms interact with each other to form molecules, which are the basis of all matter.To learn more about model of atom refer to:
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if you increase the concentration of an base, what changes in both types of bases?
Answer: Increasing the concentration of a base will cause the pH level of the solution to increase. Increasing the concentration of an acid will cause the pH level of the solution to decrease.
Explanation:
What are pollutant that caue acid precipitation to enter the air?
Select the following:
1. Drilling for natural ga
2. Burning coal
3. Tranporting petroleum
Burning coal cause acid precipitation to enter the air.
About Acid rainAcid rain is defined as all kinds of rain with a pH below 5.6. Rain is naturally acidic (pH slightly below 6) because carbon dioxide (CO2) in the air which dissolves with rainwater has the form a weak acid . This type of acid in rain is very useful because it helps dissolve the minerals in the soil which are needed by plants and animals.
Acid rain is caused by Sulfur which is an impurity in fossil fuels as well as nitrogen in the air which reacts with oxygen to form sulfur dioxide and nitrogen oxides. These substances diffuse into the atmosphere and react with water to form sulfuric acid and nitric acid which are easily soluble so that they fall with the rainwater. This acidic rainwater will increase the acidity of the soil and surface water which will prove harmful to fish and plant life. Efforts to overcome this are currently being intensively implemented.
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Balancing Chemical Equations & Identifying Chemical Reactions
Balance the Equation Identify the Type of Chemical Reaction
_____P4 + __5__O2 _____P4O10 Combustion
_____Al2O3 _____Al + _____O2
Al: Al:
O: O:
_____H2O2 _____H2O + _____O2
H: H:
O: O:
_____CH4 ______C2H6 + _____H2
C: C:
H: H:
_____C + _____H2 _____C2H6
C: C:
H: H:
_____Fe + _____H2O _____Fe3O4 + _____H2
Fe: Fe:
H: H:
O: O:
_____N2 + _____H2 _____NH3
N: N:
H: H:
_____Na + _____O2 _____Na2O
Na: Na:
O: O:
_____NaCl + _____CaSO4 _____Na2SO4 + _____CaCl2
Na: Na:
Cl: Cl:
Ca: Ca:
SO4 : SO4:
_____C2H6 + _____O2 _____CO2 + _____H2O
C: C:
H: H:
O: O:
_____K + _____B2O3 _____K2O + _____B
K: K:
B: B:
O: O:
_____Na + _____NaNO3 _____Na2O + _____N2
Na: Na:
N: N:
O: O:
Challenge:
_____CH3CH2CH2CH3 + _____O2 _____CO2 + _____H2O
How many bromide ions are there in 2.00g of MgBr2?
There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).
The chemical formula of magnesium bromide (\(MgBr_2\)) contains one magnesium ion (\(Mg2^+\)) and two bromide ions (Br-). To find the number of bromide ions in 2.00 g of \(MgBr_2\), we need to use the molar mass of \(MgBr_2\) to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound, then use the stoichiometry of the chemical formula to determine the number of bromide ions present. First, we need to calculate the molar mass of \(MgBr_2\). The molar mass of \(MgBr_2\) is equal to the sum of the atomic masses of magnesium (Mg) and two bromine (Br) atoms. The atomic mass of Mg is 24.31 g/mol, and the atomic mass of Br is 79.90 g/mol. Molar mass of \(MgBr_2\) = 24.31 g/mol + (2 x 79.90 g/mol) = 184.11 g/mol Next, we can use the molar mass to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound: Number of moles of \(MgBr_2\) = mass of \(MgBr_2\) / molar mass of \(MgBr_2\)For more questions on bromide ions
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metal ions act as Lewis acids and form complex ions with Lewis bases in the solvent.
Metal ions are able to act as Lewis acids due to their tendency to accept electron pairs from Lewis bases.
In solution, metal ions can form complex ions with Lewis bases, where the metal ion acts as the central atom and the Lewis base acts as a ligand, coordinating to the metal ion through lone pairs of electrons. These complex ions can have unique properties and play important roles in many chemical processes, including catalysis and biochemical reactions.
The formation of complex ions is often influenced by factors such as the size and charge of the metal ion, the nature of the solvent, and the structure of the ligand.
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In a reaction between sodium and oxygen to make sodium oxide. How many
liters of oxygen is needed to make 5.50 moles of sodium oxide? Write the
numerical answer only. *
Your answer
check your chemical reactions
Liters of Oxygen : 61.6 L
Further explanationGiven
5.5 moles Na₂O
Required
Liters of Oxygen
Solution
Reaction
4Na+O₂⇒2Na₂O
mol O₂ from equation :
= 1/2 x mol Sodium oxide
= 1/2 x 5.5
= 2.75
Assume at STP(1 mol gas=22.4 L), liters O₂ :
= 2.75 x 22.4
= 61.6 L
Another student is handed a sample of liquid ethanol from his teacher. He measures the volume and the volume is 50. 0 ml. His teacher tells him that the density of ethanol at room temperature is 0. 789 g/cm^3. How many moles are in his sample?
A renewable fuel called ethanol is created from various plant elements known as "biomass."
Thus, Ethanol is used to oxygenate more than 98% of the gasoline sold in the United States. E10 (10% ethanol, 90% gasoline) is typically added to gasoline, which lowers air pollution.
Ethanol is also available in the form of E85 (also known as flex fuel), which can be used in vehicles that can run on any gasoline and ethanol mixture up to an 83% concentration.
Since ethanol has a greater octane rating than gasoline, it offers superior mixing qualities. Engine knocking is prevented and drivability is ensured by minimum octane number regulations for fuel.
Thus, A renewable fuel called ethanol is created from various plant elements known as "biomass."
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A 10.0 g sample of an unknown liquid is vaporized at 120.0°C and 5.0 atm. The volume of the vapour is found to be 568.0 mL. The liquid is determined to be made up of 84.2% carbon and 15.8% hydrogen. What is the molecular formula for the liquid?
Answer:
C8H16
Explanation:
First thing to do here is to calculate the molar mass of the compound
Mathematically;
molar mass = mass/number of moles
we can calculate the number of moles using the ideal gas equation
Mathematically;
PV = nRT
n = PV/RT
where p is the pressure at 5 atm
V is the volume at 568 ml = 568/1000 = 0.568 L
R is the molar gas constant which is 0.0821
T is the temperature which is 120+ 273 = 393k
Inserting these values into the equation, we have
n = (5 * 0.568)/(0.0821 * 393)
n = 0.088 moles
So the molar mass = 10/0.088
= 114 g/mol
Now let’s go to the percentages
C = 84.2/12 = 7.016666666666667
H = 15.8/1 = 15.8
divide by the smallest
C = 7.016666666666667/7.016666666666667 = 1
H = 15.8/7.016666666666667 = 2 approximately
The empirical formula is CH2
So for the molecular formula, we have;
(12 + 2)n = 114
14n = 114
n = 114/14 = approximately 8
So the molecular formula of the liquid will be (CH2)n = C8H16
Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change?
OA. There is no change in color.
OB. There is no precipitate formed.
OC. There is no gas given off.
OD. There is no molecular change,
Explanation:
Physical change can observe by physical appearance
OA = No change in color
other choices are chemistry change
Part B
Complete each of the water tests according to the directions on the water testing
kit. Record your results in the table.
BIUX X₂ 10pt
pH and Total Alkalinity
Total Hardness
Nitrate/Nitrite and Nitrite-
Nitrogen
Iron (Fe/Fe 3)
Copper (Cu ¹/Cu*2)
Free Chlorine and Total
Chlorine
Acceptable Levels
(MCL Maximum Contaminant
Level)
pH: between 6.5 to 8.5
Total alkalinity: There is no health
standard. Values near 150 are
considered ideal.
below 500 ppm (500 mg/L)
Nitrate/Nitrite MCL 10 ppm (10 mg/L)
Nitrite-nitrogen MCL 1.0 ppm (1.0
mg/L)
Iron MCL 500 ppm (500 mg/L)
Copper MCL-1.4 ppm (1.4 mg/L)
Free Chlorine MCL -0.5 ppm (0.5
mg/L)
Total Chlorine M4 nom (4 mg/L)
Tap Water
Measurement
(mg/L)
공
Outdoor Water
Measurement
(mg/L)
pH 7.2 7.4Alkalinity Total 250 2500.5/0.5 Nitrate/Nitrite0.2 Nitrite-Nitrogen 0.2Iron 0.1 0.10.20 copper 0.20No cost chlorine 0.3 0.30.5 0.5 Total Chlorine The findings of the water tests, which were done on both outdoor and tap water, are below the permitted limits stipulated by the Maximum Contaminant Level (MCL).
The tap water's pH is 7.2, while the outside water's pH is 7.4, both of which fall within the permissible pH range of 6.5 to 8.5. According to health regulations, the combined alkalinity of the two water samples is 250 mg/L, which is optimal.
The permitted amounts of nitrate/nitrite, nitrite-nitrogen, iron, copper, free chlorine, and total chlorine are 0.5 mg/L, 0.2 mg/L, 0.1 mg/L, 0.2 mg/L, 0.3 mg/L, and 0.5 mg/L, respectively.
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what was happening to the H20 when the lines on the graph were mostly flat? What kind of energy was being added to the system?
Answer: A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it.
The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.
Water has a high boiling point because of the strong hydrogen bonds between the water molecules; it is both a strong hydrogen bond donor and acceptor.
The first change of phase is melting, during which the temperature stays the same while water melts. The second change of phase is boiling, as the temperature stays the same during the transition to gas
Explanation:
That's latent heat of vaporization.
Water boils at 100°CThe graph increases still 100°Conce it reaches boiling point it yields a straight line because of latent heat after all molecules are evaporated then the graph rises backWhich halogen has 5 energy levels?
O iodine
bromine
Xenon
O nitrogen
Answer:
nitrogeno
Explanation:
creo xdddd
Answer:
bromine
Explanation:
(Ar)3d10,4s2,4p5
how many neutrons are in the element argon?
Answer:
22 neutrons
Explanation:
According to my research there are 22 neutrons in an atom of argon.
Which of the following is a possible way to describe the H₂O component in the reaction below? 2HCl(aq) + Ca(OH)₂ (aq) → A. 2 molecules H₂O B. 1 molecule H₂O C. 2 LH₂O D. 4 moles H₂ 2H₂O(1) + CaCl₂(aq) 4
This equation shows that when hydrochloric acid (HCl) reacts with calcium hydroxide (Ca(OH)2), calcium chloride (CaCl2) and water (H2O) are produced.
Therefore, the H2O component in the reaction can be described as 2 molecules of water (2H2O), as shown in the balanced equation. Option A, "2 molecules H2O", is the correct way to describe the H2O component in the reaction.
2HCl(aq) + Ca(OH)₂ (aq) ⇒ A. 2 molecules H₂O B.
Option B, "1 molecule H2O", is incorrect as two molecules of water are produced in the reaction, not one.
Option C, "2 LH2O", is also incorrect as the symbol "L" is not used to represent water molecules in chemical equations.
Option D, "4 moles H2" is also incorrect as hydrogen gas (H2) is not produced in this reaction.
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Please Help
All matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describes a chemical property?
Select one:
a. A metal is added to a beaker of water, a gas is formed, and the beaker explodes.
b. A certain heavy metal turns to a liquid at room temperature.
c. A 2-feet-long metal bar has a mass of only 176 g.
d. A particular substance evaporates at 30 °C.
1. The unique property of an element is called
(B) valiancy
(D) oxidation number
(A) Electric negativity number
(C) Mobility
A special characteristic of an element that describes how well it can mix with other elements or compounds in chemical reactions is called the oxidation number.
What is an element's oxidation number?The number of electrons an atom or ion has either gained or lost in comparison to the neutral atom is known as the oxidation number or state of the atom or ion. Group I, 2, and 3 electropositive metal atoms lose a certain number of electrons, and their positive oxidation numbers remain constant.
Electronegative Elements – What Are They?The ability of an atom to draw shared electrons in a covalent connection is referred to as electronegativity. The stronger an element attracts the shared electrons, the higher its degree of electronegativity.
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What mass of phosphorus is in 75.0 g of calcium
monohydrogen phosphate?
Answer:The mass of phosphorus in 75.
0 g of calcium monohydrogen phosphate is 32.0 g.
Explanation:
This is because calcium monohydrogen phosphate is a compound that is composed of calcium cations (Ca2+) and monohydrogen phosphate anions (H2PO4-). The chemical formula for this compound is Ca(H2PO4)2. Since phosphorus has an atomic weight of 31 g/mol, and calcium monohydrogen phosphate contains two phosphorus atoms for each mole, the mass of phosphorus in 75.0 g of calcium monohydrogen phosphate is 32.0 g.